<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>增量动画</title>
    <style>
        .block {
            width: 100px;
            height: 100px;
            top: 100px;
            left: 100px;
            transform-origin: 50% 50%;
            position: absolute;
            background: blue;
        }
    </style>
</head>
<body>
    <div class="block"></div>
    <script>
        const block = document.querySelector('.block')
        let rotation = 0
        requestAnimationFrame(function update() {
            block.style.transform = `rotate(${rotation++}deg)`
            requestAnimationFrame(update)
        })
    </script>
</body>
</html>